World time wristwatch



y 6, 1970 w. G. DENARDO 3,513,653

WORLD :TIME WRISTWATCH Filed Dec. 28, '19s? FIG.1

w 3 1s a 5 1. Kg) 15 INVENTOR United States Patent WORLD TIME WRISTWATCHWilliam G. Denardo, 1684 9th Ave., San Francisco, Calif. 94122 FiledDec. 28, 1967, Ser. No. 694,788 Int. Cl. G041) 19/22 US. Cl. 58-425 1Claim ABSTRACT OF THE DISCLOSURE FIG. 1 is a plan view of the face ofthe improved wristwatch embodying the present invention.

FIG. 2 is a diagrammatic plan view of a portion of the mechanism whereinonly the parts required for the understanding of the invention have beenshown.

The present invention is shown in FIG. 1, wherein, the face of thewristwatch 1 containing the regular twelve hour dial 2 is smaller thanthe wristwatch casing 3 and is held in place by four brackets 4. Thehour hand 5 completes one revolution in twelve hours, minute hand 6completes one revolution per hour and second hand 7 completes onerevolution per minute. On the outer periphery of the stationarywristwatch face 1 is a circular opening '8, and below the opening 8 is amanually rotatable disk 9 with an aperture 10 through which is visiblerotary disk 11. Rotary disk 11 containing the twentyfour hour dial 12representative of universal time completes one revolution in twentyfourhours by suitable watch mechanism and gearing in synchronization withhour hand 5 and minute hand 6. T wenty-four hour dial 12, which isviewed through opening 10, can be manually adjusted by suitable gearingby rotating knob 13. Below rotatable disk 9 and concentric to rotarydisk 11 is a stationary annular rim 14 with the names imprinted upon itof geographical locations 15 for the twenty-four time zones in theirpositional arrangement relative to the international date line. Rim 14is also viewed through aperture 10. Rotatable disk 9 containing aperture10 is manually revolved by suitable gearing by rotating knob 16 to findthe locality 15 for which the correct time is desired. Since the hourhand 5 and universal twenty-four hour dial 12 will have beensynchronized to indicate the same time on both graduations, theuniversal time 12 and locality desired 15 will be in juxtaposition. Thecorresponding time 12 of any desired locality 15 can now be read throughaperture 10 for all the time zones by manually rotating disk 9 by meansof knob 16.

For the twenty-four hour dial, the time readings have been limited tohours only, since the minutes shown by the minute hand would be the samefor international twentyfour time, as they are for local time.

An alphabetical list of the principal countries, states and cities ofthe world will accompany each wristwatch. The list will indicate thetime zone they are in, as related to the localities shown on dial 14.Thus, it will be possible to immediately determine the time for majorlocalities in the world.

The world time wristwatch provides a novel device, which is easilyunderstood, for instantly reading the standard time of localities indifferent time zones. Changes in detail may be made to the form ofinvention heren shown and described, without departing from the spiritof the invention.

I claim:

1. A universal adapted wristwatch to indicate local time for theobserver and for principal localities in the various time zones aroundthe world on a twenty-four hour system, comprising a stationary dialhaving twelve hour graduations thereon repersentative of local time,below said dial a larger rotatable circular disk with an aperture, saidcircular disk having means whereby it may be manually rotated, belowsaid circular disk a rotary dial concentric with said stationary dial,said rotary dial having twenty-four hour graduations thereonrepresentative of universal time, said rotary dial having means wherebyit may be manually set to show the universal time corresponding to localtime on said stationary dial, below said circular disk and concentricwith said stationary and rotary dials is a stationary flat annular rimhaving a scale thereon with names representative of differentgeographical locations for the various time zones, an hour hand, aminute hand, means to drive said hour and minute hands and said rotarytwenty-four dial, to indicate time for a locality shown on said annularrim visible through aperture in said circular disk.

References Cited UNITED STATES PATENTS 2,189,639 2/ 1940 Manseau 58-432,305,508 12/1942 Woodrutf 58-43 2,615,298 10/1952 Ferrari 58-432,641,898 6/ 1953 Galley 58-43 RICHARD B. WILKINSON, Primary Examiner E.C. SIMMONS, Assistant Examiner US. Cl. X.R. 58-43, 127

